Intercom network, mobile terminal, and method

ABSTRACT

An intercom network (10) for real-time audio communication between users (11a, 11b, 11c, 11d, 11e, 11f, 15a, 15b), amongst other things, is represented and described, comprising at least one stationary element (12a, 12b), as a base (13), to which the users (11a, 11b, 11c, 11d, 11e, 11f) are connected, and at least one mobile terminal (15a, 15b), such as a belt pack (16) or a mobile microphone (17) that comprises an audio input (18a, 18b), wherein audio signals can be transmitted wirelessly with the mobile terminal within the DECT frequency range to the stationary element or to another stationary user, wherein the stationary element comprises a device (19) for user management that administers the users (11a, 11b, 11c, 11d, 11e, 11f, 15a, 15b) connected to the stationary element (12a, 12b), and wherein an authorization check is carried out by the device for the logging-on of the mobile terminal to the stationary element, wherein the device (19) comprises an NFC element (20a) arranged on the stationary element (12a), and wherein an NFC counter-element (21a, 21b) is arranged on the mobile terminal (15a, 15b), wherein authorization information can be transmitted by the NFC counter-element to the NFC element when the mobile terminal approaches the stationary element.

The invention relates in the first place to an intercom network with the features of the preamble of claim 1.

Such networks have been developed, marketed and used by the applicant for decades and are described for example in German patent applications DE 10 2014 011 963 [US 2016/0050505] and DE 10 2014 104 811 by the applicant. The applicant is one of the world's leading companies in the area of intercom networks.

The intercom network developed by the applicant under the name Acrobat and used for some time serves for real-time audio communication between users.

The users are for example stationary intercom communication stations, but also mobile intercom terminals. The intercom network of the prior art comprises one or more stationary elements. In the linguistic usage, the latter are also referred to as a base or aerial. The base provides a kind of switching center and can switch direct lines between the connected users. An aerial is understood to mean a further stationary element that likewise either takes over the tasks of a communication center and/or can serve as a transmitting unit and/or a receiving unit for DECT radio signals or quite generally for example for VHF, UHF, DECT signals, in particular with frequency bands 2.4 gigahertz, 5.2 gigahertz or 5.8 gigahertz and/or for connecting further stationary users.

One or more communication stations and/or one or more stationary terminals, such as for example cable-bound microphones or cable-bound headsets, can be connected to the base or the aerial.

The intercom networks of the known type also usually include one or more mobile terminals. Mobile terminals within the meaning of the patent application are understood to mean devices which can communicate wireless with one or more users of the intercom network. The DECT frequency band in particular is used for data transmission. Insofar as the DECT frequency band is specifically mentioned in this patent application, the person skilled in the art should understand this to be an exemplary embodiment of a multiplicity of possible frequency bands covered by the invention, such as for example VHF, UHF, DECT, for example in frequency ranges of 2.4 gigahertz, 5.2 gigahertz or 5.8 gigahertz. In this frequency band, audio signals can be transmitted wirelessly by the mobile terminal to the stationary element, i.e. for example to the base, or to the aerial.

The mobile terminal is formed either by a so-called belt pack, or by a mobile microphone. A mobile microphone is strictly speaking a handheld microphone device that can communicate wirelessly, in particular via a DECT radio standard.

A belt pack is a device fastened to an operator or to an item of clothing of an operator, which comprises connections for a cable with which the belt pack can be connected to the microphone or a headset.

The mobile microphone can also be a component part of a headset.

Both the microphone and the belt pack each comprise an audio input. In the case of the microphone, the microphone part itself is understood within the meaning of the invention to mean the audio input, into which an operator can directly speak audio information. In the case of a belt pack, the connection plug or the connection socket is referred to as the audio input, via which audio signals can be transmitted by a microphone or headset to be connected by a cable or wireless (for example via Bluetooth) to the belt pack.

An intercom network of the generic type is used in particular for organized events and live events. Mention can be made here for example of a song contest, such as the Eurovision Song Contest, or a sports event, for example reporting on a Formula One race. The intercom network is used on site, during the event, and provides absolutely failsafe, switchable communication connections between users.

An intercom network is configured in advance, for example in the factory, for the organized event or live event. All the required devices are assembled, and a device for user management that administers all the users to be connected to the stationary element, is set up or configured such that it knows which users are allowed to be connected to the intercom network during the event and which ones are not. When the event is being planned, it is possible to this extent to establish precisely what number of users with what functions, but in particular also what devices, are permitted to be connected to the intercom network.

The device for user management can be programmed as part of the configuration process, in particular such that it is ascertained and stored as to which specific mobile terminal is permitted to be or should be connected to the intercom network during the event.

The individual devices of the duly pre-configured intercom network are then sent to the venue of the event and set up on site.

The mobile terminals are usually allocated to operators, for example reporters, moderators or presenters.

In order that the operator with the mobile terminal can log on to the intercom network so as to be able to participate in the exchange of audio information, the inputting of a password or a PIN is required with the intercom network of the prior art. For this purpose, the mobile terminal is brought into the transmission/reception range of the stationary user of the intercom network, and a communication connection is then established between the mobile terminal and the stationary terminal via the radio connection via which the audio communication also takes place, i.e. in particular via a radio connection within the DECT frequency range. In the course of this communication exchange, the password, i.e. the identification, manually inputted by the operator on the mobile terminal is transmitted to the stationary element. The device for user management can now carry out an authorization check. If the password agrees with the password stored on a memory of this device, the mobile terminal is accepted for communication, otherwise declined.

As is customary with live events, a number of unexpected problems may arise shortly before the event. The inputting of the passwords requires a great deal of special attention, wherein the persons involved in these live events often also have to focus their attention and their concentration on numerous other aspects.

Proceeding from the intercom network of the type described at the outset, the problem of the invention consists in developing the network in such a way that its operation becomes more reliable and more convenient.

The invention solves this problem with the features of claim 1, in particular with those of the characterizing

part, and is accordingly characterized in that the device comprises an NFC element arranged on the stationary element, and that an NFC counter-element is arranged on the mobile terminal, wherein authorization information can be transmitted by the NFC counter-element to the NFC element when the mobile terminal approaches the stationary element.

The principle of the invention thus essentially consists in the fact that, instead of the manual inputting of a password required with an intercom network of the prior art so that the authorization check can be carried out, an NFC communication is now provided. For this purpose, an NFC element is arranged on the stationary element, and an NFC counter-element on the mobile terminal. NFC technology (NFC=Near Field Communication) is subject to known industry standards.

When the mobile terminal approaches the stationary element, authorization information can be transmitted according to the invention by the NFC counter-element to the NFC element.

The approach may require short distances of for example 0 to 10 cm between the two devices.

In an example of embodiment of the invention, the logging-on procedure is always initiated when a mobile terminal is brought into the vicinity of the stationary element—at least for a short time.

Authorization information that contains for example information concerning a device identification of the mobile terminal, or concerning an identification number or an identification of the mobile terminal, can be transmitted automatically by the NFC counter-element to the NFC element. Within the meaning of the invention, authorization information is regarded as any information or data which make it possible for the device for user management to carry out a check as to whether the respective mobile terminal is allowed to participate in the communication with the users of this intercom network. The device for user management is able to establish in the course of an authorization check whether the transmitted authorization information corresponds to the information which has previously been stored in a memory of the device.

Manual inputting of a password or a PIN or suchlike on the mobile terminal is to this extent no longer required. Transmission of the authorization information can take place automatically.

In this regard, the burden of inputting a password is removed from the operator. In particular, the operator no longer needs to note down a password. Valuable time and concentration is thus gained for the operator; the operation of the intercom network has become more reliable and more convenient.

A configuration of the intercom network is carried out such that, in the course of compiling the users of the intercom network participating at the event, all the devices are covered by the device for user management that will subsequently be used during the event. Provision can in particular be made such that each user has a unique identification or identification number or ID or suchlike and that the latter is allocated to him.

In the course of the transmission of authorization information by the NFC counter-element to the NFC element, this identification or device information can be transmitted to the device during a logging-on procedure on site, i.e. during or shortly before the event. A transmission of this access data can take place encrypted or, if appropriate, also unencrypted.

The intercom network according to the invention serves for real-time audio communication between users. The users can include stationary terminals or mobile terminals. A stationary terminal is understood to mean for example a communication station or a headset or a belt pack or a microphone that in each case is connected with the aid of a fixed, cable-bound connection to a stationary element, for example a switching center or a base or an aerial.

The intercom network according to the invention comprises at least one stationary or mobile element. It may for example be a base, i.e. a kind of switching center. The intercom network can however also comprise a plurality of stationary or mobile elements, for example a base and a plurality of so-called aerials connected thereto, which can operate for example in the manner of repeaters or in the manner of communication centers connected in parallel or in series.

All users are connected to the stationary element directly, or indirectly via other stationary elements.

The intercom network can include at least one mobile terminal, preferably a multiplicity of mobile terminals. Audio signals can be transmitted wirelessly with the respective mobile terminal to the stationary element, or alternatively also to another stationary user, or also to another mobile user. A transmission of the signals takes place wireless, in particular within the DECT frequency range that is laid down according to international standards.

The mobile terminal can—as the name itself indicates—be moved and displaced relative to the stationary element. The invention also covers the situation when mobile terminals transmit audio signals to different stationary users of the intercom network at different times, usually dependent on different relative positions with respect to the stationary elements of the intercom network.

The stationary element comprises a device for user management that registers and manages the users connected to the stationary element. Such an administration or management of the connected users requires for example that the device knows—at all times—which user is connected to it via which cable connection or which wireless connection, how the communication routes run, how the latter can be switched etc. The device for user management can be set up centrally or decentralized. The entire intelligence of the device for user management can be arranged centrally on the stationary element or only a part of this intelligence, the latter especially when the device for user management is set up decentralized.

An authorization check is carried out by the device for the logging-on of the mobile terminal to the stationary element. Intercom networks are covered by the invention wherein the given mobile terminal can always necessarily only be logged on to a specific stationary element, even if a plurality of stationary elements are provided in the network. However, the invention also includes the situation when the intercom network comprises a plurality of stationary elements, and the mobile terminal can log on to any of the plurality of stationary elements.

According to the invention, the device comprises an NFC element arranged on the stationary element. In the case of a plurality of stationary elements, it can be covered by the invention that an NFC element is arranged on each stationary element, or alternatively an NFC element is arranged only on one stationary element.

According to the invention, an NFC counter-element is arranged on the mobile terminal. The designations NFC element and NFC counter-element are selected arbitrarily. As commercially available components, a distinction is usually made between an NFC reader and an NFC tag. There are also conventional NFC components which comprises both parts, i.e. both the reader and also the tag. According to a variant, an NFC reader is arranged on the device for user management and an NFC tag on the respective mobile terminal. The reverse embodiment is however also covered by the invention.

Authorization information can be transmitted by the NFC counter-element to the NFC element when the two devices are brought close to one another. Such an authorization information transmission can take place every time, i.e. automatically, when the mobile terminal is brought close to the stationary element. The situation is however also covered by the invention when, to initiate the transmission of authorization information by the NFC counter-element to the NFC element, the operation of a button or a switch or another actuating element on the mobile terminal and/or on the stationary element has to be carried out by the operator.

NFC is understood to be a conventional, internationally established radio standard. The use of NFC components enables recourse to be taken to conventional, commercially available components.

According to an advantageous embodiment of the invention, the authorization information comprises a unique identification of the mobile terminal or information concerning the mobile terminal. It may for example be a unique identification which the device for user management at the stationary element can recognize, so as to be able to identify the mobile terminal as unequivocally belonging to the intercom network. In particular, however, it may also be a unique device identification that is issued only once for each mobile terminal, for example a kind of serial number.

The authorization information can comprise the identification encrypted or unencrypted, indirectly or directly. It is important that the correct mobile terminal logs on to the stationary element and that other devices not authorised for logging on to the intercom network can also be recognized by the device as not authorised, and can be excluded from logging on.

According to a further advantageous embodiment of the invention, the device for user management, in the course of carrying out the authorization check, permits logging-on of the mobile terminal to the stationary element only if the unique identification is stored as an authorised identification in a memory of the device. In the course of the configuration process of the intercom network, the authorised mobile terminals and/or information concerning them is stored encrypted or unencrypted in a memory. The device for user management carries out an authorization check when a mobile terminal logs on to a stationary element or to a mobile element, and accepts only those mobile terminals whose unique identification is contained in the memory as authorised. In this respect, the device for user management carries out a corresponding comparison.

The mobile terminal, once logged on to the intercom network, advantageously remains there until such time as a logging-off procedure is carried out.

According to a further advantageous embodiment of the invention, a plurality of mobile terminals are provided with the intercom network according to the invention. In particular, provision can be made such that each of the mobile terminals comprises an NFC element. Each of the mobile terminals can moreover have its own identification that can be transmitted to the NFC counter-element, or at any rate can be sent via the NFC counter-element to the device for user management. The invention proves to be particularly advantageous with such intercom networks, since the logging-on and registration procedures can thus be kept as short and simple as possible even in the case of a multiplicity of operators each with their own mobile terminals, since each mobile terminal can log on to the network by briefly approaching a stationary element.

According to a further advantageous embodiment of the invention, a plurality of stationary elements are provided. The device for user management can comprise a plurality of NFC elements that are split up between the plurality of stationary elements. Each of the plurality of stationary elements can advantageously comprise an NFC element in each case. With this embodiment of the invention, it is arbitrary which of the stationary elements the mobile terminal logs on to.

Irrespective of which of the stationary elements the mobile terminal has logged on to, the device for user management can acquire the information via the accomplished logging-on. The device for user management is organized decentralized here, and can carry out authorization checks irrespective of which stationary terminal a mobile terminal is trying to log on to.

According to a further advantageous embodiment of the invention, by a relative approach of a first mobile terminal toward a second authorised mobile terminal, authorization information can be transmitted by the NFC counter-element of the second mobile terminal to the NFC counter-element of the first mobile terminal. This information is transmitted wirelessly to the user management by the NFC counter-element of the first mobile terminal.

With this embodiment of the invention, a belt pack as a mobile terminal, for example, can not only itself carry out logging on to a stationary element, but rather a second belt pack, i.e. a second mobile terminal, can carry out logging-on to this above terminal. Thus, if appropriate, a plurality of mobile terminals can also log on successively at a first mobile terminal, and the latter can transmit the authorization information to the user management. The logging-on and registration procedure in the case where a plurality of mobile terminals are being used thus also becomes considerably more reliable and simplified.

The device for the management of users does not activate corresponding audio channels for communication between the users for the given mobile terminals until an authorization process has led to a positive result.

According to a further advantageous embodiment of the invention, an actuating element is arranged on the mobile terminal, as a result of the actuation whereof logging-off of the mobile terminal from the intercom network can be brought about. For example, a simple key or button can be provided here that when actuated logs off the mobile terminal from the intercom network.

Such a logging-off procedure can advantageously be logged and/or secured by the device for the management of users, so that it is ensured that communications to the logged-off mobile terminal are not carried out inadvertently.

According to a further aspect, the invention relates to a mobile terminal according to claim 9.

The problem of the invention consists in providing a mobile terminal, the reliability and handling whereof in connection with the process of logging on to the intercom network of the generic type is simplified.

The invention solves this problem with the features of claim 9.

In order to avoid repetition, reference is made to the above comments with regard to the terms and features used and their interpretation.

According to a further aspect, the invention relates to a method of the logging-on of a mobile terminal to a stationary element of an intercom network according to claim 10.

The problem underlying the invention is to develop such a method, such as is known with a generic intercom network and has been described, in such a way that said method is simpler, more convenient and more reliable.

The invention solves this problem with the features of claim 10.

Once again to avoid repetition, reference is also made to the above comments with regard to the interpretation of the features and the terms used.

For the sake of clarification, it should be pointed out that process steps a) to d) of claim 10 are carried out before the start of the live event or organized event that is due to take place, especially, but not exclusively, at another location from the event venue.

On the other hand, step e) of logging on the mobile terminal is carried out directly just before the start of the event or during the event, in particular at the event venue.

The invention further relates to an intercom network according to the preamble of claim 11.

The principle of the invention once again consists in developing a known intercom network of the prior art, as described at the outset, in such a way that the network becomes more reliable and more convenient.

The invention solves this problem with the features of claim 11, in particular with those of the characterizing part, and accordingly is characterized in that the device comprises an RFID element arranged on the stationary element, and that an RFID counter-element is arranged on the mobile terminal, wherein authorization information can be transmitted by the RFID counter-element to the RFID element when the mobile terminal approaches the stationary element.

With regard to the meaning and interpretation of the features of claim 11 and the description of the advantages of the teaching according to claim 11 and its mode of functioning, reference may be made, to avoid repetition, to the above comments in respect of claim 1 and also with respect to the dependent claims following claim 1. According to the teaching of claim 11, an RFID element and an RFID counter-element can be used instead of an NFC element and instead of an NFC counter-element.

Moreover, the present invention covers any combinations of the subject-matter of claim 11 with features of the present patent application which are described only or also with respect to NFC technology. Within the scope of the invention, these features can also be used in respect of RFID elements and RFID counter-elements, and such applications are also covered by the invention.

According to a further aspect, the invention relates to a method according to claim 12.

The problem underlying the invention is to develop the method described at the outset in such a way that it is simplified, more convenient and more reliable.

The invention solves this problem with the features of claim 12.

Once again to avoid repetition, reference is made to the above comments, also with respect to interpretation of the features, wherein the comments made in respect of NFC element and NFC counter-element also apply analogously to the RFID element and the RFID counter-element.

Further advantages of the invention emerge from the uncited sub-claims, and also on the basis of the following description of the embodiments represented in the figures.

In the figures:

FIG. 1 shows in a diagrammatic view, in the form of a block diagram, an example of embodiment of an intercom network according to the invention with two stationary elements, six stationary users connected thereto, and two mobile terminals, also in a diagrammatic representation in the form of a block diagram,

FIG. 2 shows in a diagrammatic perspective view a mobile terminal constituted as a belt pack, somewhat as shown in partial circle II in FIG. 1, with a headset connected thereto via cable, and

FIG. 3 shows in a diagrammatic representation an operator who is carrying such a belt pack and a headset, as shown in FIG. 2.

Embodiments of the invention are described by way of example, in the following description of the figures, also making reference to the drawings. For the sake of a clear illustration—and also as far as different embodiments are concerned—identical or comparable parts or elements or regions are denoted by identical reference numbers, in some cases with the addition of lower-case letters.

Features which are described only in respect of one example of embodiment can, within the scope of the invention, also be provided with every other example of embodiment of the invention. Such amended embodiments—even if they are not represented in the drawings—are also covered by the invention.

All the disclosed features are in themselves essential to the invention. In the disclosure of the application, the disclosure content of the associated priority documents (copy of the prior application) and of the cited publications and of the described devices of the prior art are thus also included in their entire content, including for the purpose of also adopting individual or a plurality of features of these documents in one or in a plurality of claims of the present application.

An example of embodiment of the invention is represented diagrammatically in FIG. 1, and is denoted as a whole by 10 as an intercom network.

Intercom network 10 of FIG. 1 comprises a multiplicity of users that are denoted by reference numbers 11 a, 11 b, 11 c, 11 d, 11 e, 11 f. Intercom network 10, moreover, comprises a stationary element 12 a that is constituted as a base, and a further stationary element 12 b that is constituted as a so-called aerial.

Each of users 11 a, 11 b, 11 c, 11 d, 11 e, 11 f is constituted as a communication station 23 a, 23 b, 23 c, 23 d, 23 e, 23 f. Each communication station is a conventional electronic device that comprises in particular a microphone, a loudspeaker and direct-dial buttons. To avoid repetition, reference may be made to the applicant's German patent applications DE 10 2014 011 963 A1 and DE 10 2014 104 811 A1 with regard to the term communication station.

Each of communication stations 23 a, 23 b, 23 c, 23 d, 23 e, 23 f constitutes in this regard a stationary user 11 a, 11 b, 11 c, 11 d, 11 e, 11 f, who is connected in each case by an electrical connecting line 24 a, 24 b, 24 c, 24 d, 24 e, 24 f to at least one of two stationary elements 12 a, 12 b. As a result of the cable-bound connection between user 11 a, 11 b, 11 c, 11 d, 11 e, 11 f and stationary element 12 a, 12 b, corresponding user 11 a, 11 b, 11 c, 11 d, 11 e, 11 f is a stationary, i.e. non-mobile, user.

Not represented in FIG. 1, but covered by the invention, are also intercom networks wherein so-called belt packs or microphones are connected via a cable to a stationary element 12 a, 12 b. One then also speaks of stationary users.

A base 13 is provided in intercom network 10 according to the example of embodiment of FIG. 1. This base comprises a device 19 for the management of connected users 11 a, 11 b, 11 c, 11 d, 11 e, 11 f. Device 19 for the management of users can be constituted by a microprocessor, or can include such a device.

In the example of embodiment of FIG. 1, an aerial 14 is also provided in addition to so-called base 13.

The invention also includes embodiments of networks 10, wherein no aerial 14 is provided, and also embodiments, wherein a plurality of aerials are provided. The more aerials 14 that are provided, or the more base elements 13 that are provided, the more pronounced the intelligence of the control unit can be, i.e. the intelligence of device 19 for user management can be constituted decentralized, distributed over a plurality of stationary elements 13, 14.

Device 19 for the user management administers and manages the switching routes between individual users 11 a, 11 b, 11 c, 11 d, 11 e, 11 f.

A mobile terminal 15 a in the form of a belt pack 16 and a further mobile terminal 15 b in the form of a mobile microphone 17 are provided as further users of intercom network 10 according to the example of embodiment of FIG. 1.

Mobile microphone 17 comprises an audio input 18 b, into which speech signals can be directly inputted by an operator 33.

Belt pack 16, on the other hand, comprises an audio input 18 a which is constituted as an audio connection, for example as a socket or a plug, for receiving a cable 25 not represented in FIG. 2, for the connection to a microphone or to a headset 28 according to FIG. 2.

According to the example of embodiment of FIG. 1, a belt pack 16 and a mobile microphone 17 are provided in the example of embodiment of an intercom network 10. However, the invention also covers embodiments wherein a plurality of belt packs 16 and/or a plurality of mobile microphones 17 are provided. The invention also covers intercom networks wherein no stationary users 11 a, 11 b, 11 c, 11 d, 11 e, 11 f, but only mobile terminals 15 a, 15 b are provided.

Whereas audio signals are transmitted via cable-bound communication routes 24 a, 24 b, 24 c, 24 d, 24 e, 24 f via stationary users 11 a, 11 b, 11 c, 11 d, 11 e, 11 f, corresponding audio signals can be transmitted wirelessly from and to mobile terminals 15, 15 b. For this purpose, recourse is taken in particular to the DECT radio standard.

Each of mobile terminals 15 a, 15 b comprises in this regard a communication module, with which audio signals can be received and sent. Likewise, base 13 and/or aerial 14 and/or stationary users 23 a, 23 b, 23 c, 23 d, 23 e, 23 f comprise corresponding communication modules, with which audio signals can be transmitted, i.e. received and sent, in particular according to radio standard DECT.

The respective communication modules for the audio signal transmission in mobile terminals 15 a, 15 b and in base 13 and/or aerial 14 are not represented in the figures for the sake of clarity. They are conventional, commercially available modules that are also already used in intercom networks of the prior art and in the corresponding mobile terminals.

Intercom network 10 according to the invention is usually, even if not exclusively, used at live events, at organized events, in the world of theater etc. In order to guarantee smooth running of the event, intercom network 10 is configured beforehand, for example in the factory. For this purpose, intercom network 10 is compiled with regard to the required devices or users. As far as the selection of mobile terminals 15 a, 15 b is concerned, it should be pointed out that each of the mobile terminals can comprise an electronic component 29 a, 29 b, in which an

identification, in particular a device identification, or a device identification number or suchlike, is noted. The identification can for example be a serial number of the device, or at any rate a code that enables identification of the device by device 19 for user management.

For the sake of clarification, it should be mentioned that components 29 a, 29 b can also be combined with the respective NFC counter-element 21, 21 b to be explained later, or can be a component part of the latter.

Those mobile terminals 15 a, 15 b which are to be connected to intercom network 10 according to FIG. 1 during the event are taken into account in the configuration beforehand, i.e. ex-works for example. For this purpose, device 19 for user management is informed, as part of the configuration process of intercom network 10, in particular by means of configurations software, that a specific mobile terminal 15 a, for example belt pack 16 of FIG. 1, with a specific identification is to be accepted for logging on during the event. A memory is assigned to device 19 for user management, in which memory this identification is stored.

It should be pointed out that a configuration of intercom network 10 can be carried out for example sometime before the event, for example even several weeks or months before the event, since a great deal of time is often required to transport the individual devices of intercom network 10 to the event venue.

Once intercom network 10 of FIG. 1 has been set up on site, i.e. at the event venue, for the purpose of performing the event, and is put into operation, mobile terminals 15 a, 15 b to be used in intercom network 10 have to be logged on to or registered with the system. On the one hand, it is thus possible to prevent unauthorized devices from gaining access. On the other hand, it can be ensured that the correct devices, i.e. for example mobile terminals 15 a, 15 b, which also provide the required technical properties, are connected to intercom network 10.

Moreover, it can thus be ensured that, in the case where two or more intercom systems are used during the event, the correct mobile terminal 15 a, 15 b is logged on to the correct intercom system 10, and not inadvertently to the wrong intercom system 10.

In order to design this registration process so as to be as reliable and convenient as possible, an NFC element 20 a is connected via a control line 30 a to device 19 for user management at base 13. NFC element 20 a can be constituted for example by a conventional NFC reader, such as is commercially available.

Mobile terminal 15 a in the form of belt pack 16 in FIG. 1 comprises an NFC counter-element 21 a. If NFC element 20 a and NFC counter-element 21 a are brought close to one another, for example to a distance of less than 10 cm from one another, the identification stored for example in memory 29 a or in NFC counter-element 21 a can be transmitted by NFC counter-element 21 a to NFC element 20 a, and from there transmitted onward to device 19 for user management. The latter checks the received data, compares the latter with data filed in memory 22, and can then decide by comparing them whether belt pack 16 or mobile terminal 15 a of FIG. 1 is authorised for connection to stationary element 12 a or not. Only in the case where a positive authorization check results can mobile terminal 15 a participate in the communication with other users 23 a, 23 b, 23 c, 23 d, 23 e, 23 f of intercom network 10.

It should be noted that memory 22, according to FIG. 1, is connected via a control line 30 b to device 19. Memory 22 can of course also be a component part of device 19.

NFC element 30 a can also be a component part of device 19.

Memory 29 a of mobile terminal 15 a can likewise be a component part of the NFC counter-element. Suitable electronic units and elements and circuits can be used here.

Needless to say, it is pointed out that mobile terminal 15 a, 15 b has a voltage supply, for example via a battery or a rechargeable battery or suchlike, so that, insofar as required, the electronic and electrical elements and components of mobile terminal 15 a, 15 b can be supplied with the required operating voltage.

Stationary element 12 a, 12 b is likewise provided with a voltage supply (not represented), a line or a mains cable, so as to provide for the operation of electronic and electrical components of stationary element 12 a.

Aerial 14 has a comparable structure. Here, a component 32 is provided that can be regarded as part of device 19 of stationary element 12 a. Component 32 is connected via a control line 30 c to a further NFC element 20 b. In this example of embodiment, mobile terminal 15 a can for example log on to stationary element 12 a or alternatively also to stationary element 12 b.

According to the example of embodiment of FIG. 2, it should be pointed out that a belt pack 16 can be connected via a cable 25 to a headset 28, and—as shown in FIG. 3—can be carried on a person's body. Headset 28 can comprise a microphone 26 and headphones 27. Other embodiments than those represented in FIGS. 2 and 3 are of course also covered by the invention. Person 33 according to FIG. 3 is to be understood only as an example, and can for example illustrate a moderator of a television transmission.

An actuating element 31 a in the form of a button, a switch or a knob is fitted to mobile terminal 15 a, 16. By actuation of actuating element 31 a, logging-off of this mobile terminal 15 a from intercom network 10 can take place. For example, by actuation of actuating element 31 a, it can be communicated to device 19 via NFC counter-element 21 a and NFC element 20 a that this mobile terminal 15 a is logging off from intercom network 10.

A second mobile terminal is represented in FIG. 1 in the form of mobile microphone 17.

Here too, an electronic component 29 a is indicated, in which an identification of this microphone 17 can be stored. NFC counter-element 21 b functions in the same way as NFC counter-element 21 a described above.

Mobile microphone 17 according to FIG. 1 also comprises an actuating element 31 b, with which logging-off of the mobile microphone from intercom network 10 can be carried out. 

1. An intercom network for real-time audio communication between users, the network comprising: at least one stationary element, to which the users are connected; at least one mobile terminal that comprises an audio input and that can transmit audio signals wirelessly within the DECT frequency range to the stationary element or to another stationary user; a device in the stationary element for user management that administrates the users connected to the stationary element, and that carries out an authorization check for logging-on the mobile terminal to the stationary element; an NFC element arranged in the device on the stationary element; and an NFC counter-element on the mobile terminal that can transmit authorization information to the NFC element when the mobile terminal approaches the stationary element.
 2. The intercom network according to claim 1, wherein the authorization information comprises a unique identification of the mobile terminal.
 3. The intercom network according to claim 2, wherein the device, in the course of carrying out the authorization check, permits logging-on of the mobile terminal to the stationary element only if the unique identification is stored as an authorised identification in a memory of the device.
 4. The intercom network according to claim 1, wherein a plurality of mobile terminals are provided.
 5. The intercom network according to claim 4, wherein the plurality of mobile terminals each comprise a respect NFC counter-element with its own identification.
 6. The intercom network according to claim 1, wherein a plurality of stationary elements are provided, and that the device comprises a plurality of respective NFC elements for the plurality of stationary elements.
 7. The intercom network according to claim 4, wherein, by a relative approach of a first mobile terminal toward a second mobile terminal, authorization information can be transmitted by the NFC counter-element of the second mobile terminal to the NFC counter-element of the first mobile terminal and from there onward to the NFC element of the stationary element.
 8. The intercom network according to claim 1, further comprising: an actuating element on the mobile terminal that when actuated logs off the mobile terminal from the intercom network.
 9. A mobile terminal for use in an intercom network according to claim 1, wherein the NFC counter-element on the mobile terminal can transmit authorization information to the NFC element on the stationary element when the mobile terminal approaches the stationary element of the intercom network.
 10. A method of logging onto a mobile terminal to a stationary element of an intercom network, the users whereof can transmit audio signals wireless within the DECT frequency range to conduct real-time audio communication, comprising the following steps: a) providing of at least one stationary element that is provided with an NFC element, b) providing of a device for user management, with which the users connected to the stationary element can be administrated, c) providing of at least one mobile terminal, on which an NFC counter-element is arranged, d) configuring of the intercom network, wherein a unique identification of the mobile terminal is stored in a memory of the device, e) logging the mobile terminal onto the stationary element by bringing the mobile terminal close to the stationary element, wherein, as a result of the approach, authorization information is transmitted by the NFC counter-element of the mobile terminal to the NFC element on the stationary element.
 11. An intercom network for real-time audio communication between users, the network comprising: at least one stationary element to which the users are connected; at least one mobile terminal that comprises an audio input and that can transmit audio signals wirelessly with the mobile terminal in the DECT frequency range, to the stationary element or to another stationary user; a device in the stationary element for user management that administers the users connected to the stationary element and that carries out an authorization check by the device for the logging-on of the mobile terminal to the stationary element; an RFID element arranged in the device on the stationary element; and an RFID counter-element on the mobile terminal for transmitting authorization information by the RFID counter-element to the RFID element when the mobile terminal approaches the stationary element.
 12. A method of logging onto a mobile terminal to a stationary element of an intercom network as defined in claim 11, the users whereof can transmit audio signals wireless, in particular within the DECT frequency range, to conduct real-time audio communication, comprising the following steps: a) providing of at least one stationary element that is provided with an RFID element, b) providing of a device for user management, with which the users connected to the stationary element can be administrated, c) providing of at least one mobile terminal, on which an RFID counter-element is arranged, d) configuration of the intercom network, wherein a unique identification of the mobile terminal is stored in a memory of the device, e) logging on of the mobile terminal to the stationary element by bringing the mobile terminal close to the stationary element, wherein, as a result of the approach, authorization information is transmitted by the RFID counter-element of the mobile terminal to the RFID element on the stationary element. 